package dem1;

import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

/**
 * Created with Intellij IDEA.
 * Description:
 * User: 33013
 * Date: 2023-05-19
 * Time: 21:12
 */
public class Test {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
         //注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String a = in.nextLine();
            String b = in.nextLine();
            func(a,b);
        }
    }
    public static void func(String str1, String str2){
        Set<Character> set1 = new HashSet<>();
        str1 = str1.toUpperCase();
        str2 = str2.toUpperCase();//
        for (int i = 0; i < str2.length(); i++) {
            set1.add(str2.charAt(i));
        }
        Set<Character> set2 = new HashSet<>();//
        for (int i = 0; i < str1.length(); i++) {
            char ch = str1.charAt(i);
            if (!set1.contains(ch) && !set2.contains(ch)){
                set2.add(ch);
                System.out.print(ch);
            }
        }
        System.out.println();//
    }
}
